What lies beneath?

Museum conservationists never know what they might discovered under layers of paint and grime. What lies beneath the surface is the subject of a new display at London's National Portrait Gallery which reveals, for the first time, some of the conservationists' findings.

The Real Tudors: Kings and Queens Rediscovered, which runs until March 2015, offers discoveries such as a bug painted into a portrait of Edward VI, and a contemporary painting of Elizabeth I, whose image was "prettied up" in the 18th century.